The ancient sea purple will always be agate. Purple Julai, also known as Suji agate, is one of the three precious agates in the world. The only Zijulai mining area in the world is located in Verseur, northern cape. It is estimated that the high-quality purple agate only accounts for less than 0.0 1% of the total exploitation, which is non-renewable and very rare, so the precious purple agate is of high collection value. Gu Hai purple agate is formed by calcium ions and iron ions in calcium, and is regarded as one of the important representative works in jewelry culture. Agate, also known as agate, Kate Ma, agate, etc. , is a chalcedony mineral. It is usually a banded block mixed with opal and aphanitic, with hardness of 6.5-7 degrees and specific gravity of 2.65. Its color is quite layered, translucent and opaque. The original form of agate is a tripartite crystal system.